Gasoline engine



FIG. 1 is a left side view of a gasoline engine showing our new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a perspective view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a top view thereof.

The portions of the engine shown in broken lines form no part of the claimed design. 

The ornamental design for a gasoline engine, as shown and described. 